Starting 3rd October 2022, you may receive the below message when trying to authorize (or re-authorize) your Google Drive or Google Photos accounts via older versions of SyncBackPro prior to version V10.2.39.0.
Access blocked: SyncBackPro’s request is invalid
Error 400: invalid_request
The reason for the error is that Google has decided to stop accepting authorization requests using the legacy OOB (out-of-band) OAUTH flow.
The deprecation announcement was made back in February 2022
https://developers.googleblog.com/2022/02/making-oauth-flows-safer.html
If you are a SyncBackPro V10 user and you are running a version older than V10.2.39.0 then you need to update to the latest V10 version from our website at https://www.2brightsparks.com/downloads-legacy.html
If you are running a SyncBackPro version prior to V10 (e.g. V8 or V9) then your only solution is to upgrade to V11 by visiting our upgrade store at www.2brightsparks.com/store/upgradestore.php. Your existing profiles may continue working but authorizing with a Google account will fail unless you upgrade to V10.2.39.0 (or newer).